Frost Dates for Vacaville, CA

Elevation: 34 m

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. January 31
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. December 11

30% Probability

Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost February 15
First Fall Frost December 3

Hard Freeze (28°F)

Last Spring Hard Freeze January 6
First Fall Hard Freeze December 23
38.40°N, 121.96°W © OpenStreetMap

Growing Season

315 Days January 31 to December 11

USDA Hardiness Zone

Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.
Zone 9a

Avg. annual minimum: 20 to 25°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Csa Hot-Summer Mediterranean

Hot, dry summers and mild, wet winters. Classic Mediterranean climate ideal for grapes, olives, tomatoes, and herbs. Summer irrigation is usually necessary.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January58°49°40°
February63°53°42°
March69°57°45°
April75°62°48°
May83°68°53°
June91°74°58°
July97°79°60°
August97°78°60°
September92°75°58°
October81°67°52°
November67°56°45°
December58°49°40°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January7.6
February8.8
March7.4
April3.5
May2.0
June0.0
July0.0
August0.0
September0.0
October1.8
November5.8
December7.7

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 14h 41m · Shortest: 9h 19m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:29 AM5:05 PM9h 36m
February7:06 AM5:39 PM10h 34m
March7:26 AM7:09 PM11h 42m
April6:38 AM7:38 PM13h 00m
May6:02 AM8:07 PM14h 05m
June5:48 AM8:28 PM14h 40m
July6:01 AM8:26 PM14h 26m
August6:27 AM7:57 PM13h 30m
September6:55 AM7:09 PM12h 14m
October7:24 AM6:22 PM10h 58m
November6:57 AM4:49 PM9h 52m
December7:24 AM4:44 PM9h 20m

Nearby Stations

Vacaville Nut Tree AP, CA February 18 - November 28 Lake Solano, CA February 4 - December 5 Winters, CA February 18 - November 30 Fairfield, CA January 15 - December 14 Markley Cove, CA March 6 - November 30 Davis 2 Wsw Exp Farm, CA February 10 - December 1

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